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This document provides information about how Microsoft Internet Information Server (IIS), the ASP.NET application server, and the Sitecore Web Content Management System (CMS) handle the HTTP 404 Page Not Found condition. Sitecore developers can use this information to handle the HTTP 404 Page Not Found condition consistently, or for specific purposes such as providing search results.

To download the document, click one of the below links.
Sitecore CMS 6.0-6.4 versions:

• Download the Handling HTTP 404 document in A4 format (PDF,  0.2 MB) 
• Download the Handling HTTP 404 document in US-Letter format (PDF,  0.2 MB)

Below you will find the contents of the document:

The HTTP 404 Page Not Found Condition
    Overview of the HTTP 404 Page Not Found Condition
        IIS HTTP 404 Page Not Found Management
        Sitecore HTTP 404 Page Not Found Management
            The LinkItemNotFound Setting
    Consistent HTTP 404 Page Not Found Management
    HTTP 404 Page Not Found Pipeline Processor

If your custom 404 page is ignored by IIS 7, see this article for the solution.